White wheels do look nice, however I hope you've got lots of free weekends.... Now, I know it's not a car, but I used to have a Kawasaki GPZ500s with White wheels. In the space of a week the back wheel was a nice black / grey where my chainlube had been flung onto the rim and was coated nicely with brake dust and other road muck. The front wheel took a bit longer to get bad, but was the same story (minus the chainlube). Brakedust, wet tar (from newly surfaced roads) and other mess left behind by other vehicles & white wheels really don't go well together! I went through lots of wheel cleaning products like it was water. Next bike had silver / grey rims (CBR400 Grey import) and thankfully I spent less time bent over cleaning wheels!